Sock



FIG. 1 is a perspective view of the sock showing the design;

FIG. 2 is a side view of the design;

FIG. 3 is a front view of the design;

FIG. 4 is a back view of the design;

FIG. 5 is a top view of the design; and,

FIG. 6 is a cross sectional view along line 6-6 of FIG. 2 of the design.

The broken lines defining the foot of the sock or underlying sock or leg are shown for illustrative purposes and do not form a part of the claimed design. 

CLAIM The ornamental design for a sock, as shown and described. 